usp10: Do not crash in ScriptPlace if pABC is null.

dlls/usp10/usp10.c

@@ -1309,7 +1309,7 @@ HRESULT WINAPI ScriptPlace(HDC hdc, SCRIPT_CACHE *psc, const WORD *pwGlyphs,
      *   to get the correct ABC widths.   */
 
      if (!(lpABC = usp_zero_alloc(sizeof(ABC) * cGlyphs))) return E_OUTOFMEMORY;
-
+     if (pABC)
         memset(pABC, 0, sizeof(ABC));
 
     /* FIXME: set pGoffset to more reasonable values */
@@ -1330,14 +1330,18 @@ HRESULT WINAPI ScriptPlace(HDC hdc, SCRIPT_CACHE *psc, const WORD *pwGlyphs,
                                   lpABC[wcnt].abcA,
                                   lpABC[wcnt].abcB,
                                   lpABC[wcnt].abcC, wcnt);
+             if (pABC)
+             {
                 pABC->abcA += lpABC[wcnt].abcA;
                 pABC->abcB += lpABC[wcnt].abcB;
                 pABC->abcC += lpABC[wcnt].abcC;
+             }
              piAdvance[wcnt] = lpABC[wcnt].abcA + lpABC[wcnt].abcB + lpABC[wcnt].abcC;
              pGoffset[wcnt].du = 0;
              pGoffset[wcnt].dv = 0;
          }
      }
+     if (pABC)
         TRACE("Total for run:   abcA=%d,  abcB=%d,  abcC=%d\n", pABC->abcA, pABC->abcB, pABC->abcC);
 
      usp_free(lpABC);